Lifting-jack



(No Model.)

W. TUCKER.

LIFTING JACK. No. 388,090; Patented Aug. 21, 1888.

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NITED STATES PATENT OFFICE.

WILLIAM TUCKER, OF DEOHERD, MISSOURI.

LIFTING=JAGK.

SPECIFICATION forming part of Letters Patent No. 388,090, dated August21,1888.

Application filed April 26,1888. Serial No.2'71.939. (No model.)

To aZZ whom it may concern:

Be it known that I, WILLIAM TUCKER, a citizen of the United States,residing at Decherd, in the county of St. Clair and State of Missouri,have invented a new and useful Improvement in Lifting-Jacks, of whichthe following is a specification.

The invention relates to improvements in lifting-jacks; and it consistsin the construction and novel combination of parts hereinafterdescribed, illustrated in the drawings, and pointed out in the appendedclaim.

Figure l of the drawings represents a perspective view of a lifting-jackembodying the invention. Fig. 2 represents a central vertical section ofthe same, showing the eccentric lever raised in full lines and the samelowered in dotted lines. This view illustrates the manner in which theload, by pressing on the liftingblock, prevents the eccentric-lever fromrais- 1ng.

Referring to the drawings by letter, A designates the frame or casing ofthe device, composed of the similar rectangular side plates, B B, andthe base-block O. The two plates are connected in rear by the narrowstrip 0, and in front, at top, by the short block D, having thedownwardly and inwardly inclined outer edge,d, and at bottom by thelarger block, E, having the upwardly and inwardly inclined outer edge,0. These inclined edges, respectively, form the upper and lower stopsfor the eccentric-lever.

F is the liftingblock, of general rectangular shape, the lower part ofwhich fits snugly in the open upper end of the casing, and has ahorizontal lower edge. The vertical arm f of the lifting-block may haveits upper end straight or concave, as desired. The liftingblock ispreferably of steel.

G is the eccentric-disk, the shaft of which is journaled at g in theside plates, B, and which is provided with the lever H, that passesoutward through the space between the inclined edges (1 and e. The edgeof the eccentric is so arranged in relation to the lever H that when aload is lifted and the lever rests against theinclined edge e the pointofthe edge farthest from the eccentric-shaft is slightly in front of thecenter of the lower meetingedge of the lifting block, and consequentlythe pressure of the load will tend to rotate the eccentric forward,keeping the lever tight against the stopedge e, and the heavier the loadthe more strongly will the lever be held down. Thus when the load isonce lifted it will be retained up, permitting the operator to use bothhands for the necessary work.

The jack is used principally to lift wagons and other vehicles, but mayobviously be used for various purposes ofthe kind.

Having described my invention, I claim- The improved lifting-jack hereindescribed and shown, comprising the side plates, B B, the base-block 0,connecting the lower ends of the same, the vertical strip a, connectingthe rear edges of the plates and closing the space between the same,'theblock D at the upper front corners of the plates B B, having adownwardly and inwardly inclined lower edge, (I, the block E at thelower front corners of said plates, having an inwardly and upwardlyinclined upper edge, e, the liftingblock F, sliding between the block Dand the strip a, and the eccentricblock pivoted between the side platesbelow the lifting-block and the block D, and having a lever-handleprojecting outwardly between the inclined edges of the blocks 1) and E,as specified.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in presence of two witnesses.

\VILLIAM TUCKER.

Witnesses:

W. P. SHELDON, J OHN SEEvERs.

